TMI/Hattori SEIKO VD79 Movement Date Star

Product Description

The TMI/Seiko VD79 Movement Date Star is a genuine Japanese-made component for the VD79 quartz movement . As a key part of the calendar mechanism, the date star drives the date hand at the 6 o’clock subdial, ensuring accurate calendar display . This genuine TMI/Seiko part is essential for watchmakers restoring proper date function when the original component becomes worn or damaged.

Features & Function

• Genuine TMI/Seiko part – authentic Japanese-made component for the VD79 movement

• Calendar mechanism component – drives the date hand at the 6 o’clock subdial

• Quick-set function compatible – works with the crown’s first position for rapid date adjustment 

• Essential for service – commonly replaced when date hand operation becomes irregular

Specifications

• Compatible Movement: TMI/Seiko VD79, VD79A 

• Movement Size: 10½ ligne (approx. 23.3-23.7mm) 

• Movement Height: 3.45mm

• Subdial Positions: Day at 9 o’clock, Date at 6 o’clock 

• Hand Sizes: Hour 1.20mm / Minute 0.70mm / Sub hands 0.20mm

• Battery: 377 / SR626SW

• Stem: 351177, Tap 10 

• Origin: Japan 

Applications

• Service and repair – replacing worn or damaged date stars in VD79 movements

• Calendar function restoration – resolving issues with date hand advancement

• Suitable for professional watchmakers and experienced repair technicians

FAQs

1. Is this a genuine TMI/Seiko part?

Yes, this is a genuine Seiko (TMI) factory part made in Japan. The VD79 is a quartz movement manufactured by Time Module Inc. (TMI), featuring two subdials for day and date indicators .

2. Which movements is this date star compatible with?

This date star is compatible with the TMI/Seiko VD79 and VD79A movements. The VD79 is a 10½ ligne quartz caliber with two hands and two subdial indicators for day at 9 o’clock and date at 6 o’clock .

3. How does the date function work in the VD79?

The date is set by pulling the crown to position 1 (first click) and turning it counter-clockwise . The date hand at the 6 o’clock subdial advances accordingly. It is recommended not to set the date between 10:00 PM and 2:00 AM to avoid calendar mechanism issues .

Why Choose SOFLY Watch Parts?

• Fast worldwide shipping within 3 business days.

• Competitive pricing on Seiko/Hattori calibers.

• 3,000+ watch movements and parts in stock.

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• Personalized sourcing support via [email protected] or WhatsApp +86 18620212114.